我怎么去阅读bittorrent作品？

Question

我目前正在为Ruby开发一个torrent metainfo管理库。

我无法从文件中读取这些内容。我只是不明白我应该怎么做。我知道我应该SHA1消化一次文件的篇幅字节（或多次读一段长度字节，或者什么？）

我指望你的帮助。 伪/ Python / Ruby / PHP代码首选。

提前致谢。

Answer 1

C＃

// Open the file
using (var file = File.Open(...))
{
    // Move to the relevant place in the file where the piece begins
    file.Seek(piece * pieceLength, SeekOrigin.Begin);

    // Attempt to read up to pieceLength bytes from the file into a buffer
    byte[] buffer = new byte[pieceLength];
    int totalRead = 0;
    while (totalRead < pieceLength)
    {
        var read = stream.Read(buffer, totalRead, pieceLength-totalRead);
        if (read == 0)
        {
            // the piece is smaller than the pieceLength,
            // because it’s the last in the file
            Array.Resize(ref buffer, totalRead);
            break;
        }
        totalRead += read;
    }

    // If you want the raw data for the piece:
    return buffer;

    // If you want the SHA1 hashsum:
    return SHA1.Create().ComputeHash(buffer);
}

Answer 2

请在此处查看此分发：

http://prdownload.berlios.de/torrentparse/TorrentParse.GTK.0.21.zip

用PHP编写，它包含一个编码器和解码器以及我相信的输入和输出！